zitterbewegung

Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

n. An extremely fast oscillation of free electrons (and other particles) predicted by some solutions of the Dirac equation

Etymologies

German zittern (to tremble) and Bewegung (motion) (Wiktionary)

Examples

Another consequence of those negative-energy states is the phenomenon given the awesome name zitterbewegung which, while it sounds to American ears like a dramatic exclamation actually translates to the relatively anticlimactic "trembling motion."